Beach-forming jetties.



M. A. CALLAHAN.

BEACH FORMING JETTkES.

APPLICATION FILED FEB- 2. 1914.

MARK A. CALLAHAN, OF CLEVELAND/OHIO.

BEACH-FORMING JETTIES.

Specification of Letters Patent.

Patented Apr. 27, I915.-

Application filed February 2, 1914. Serial No. 815,891.

To all whom it may concern:

Be it known that I, MARK A. CALLAHAN, a citizen of the United States,residing at Cleveland, in the county of Cuyahoga and State of Ohio, haveinvented a certain new and useful Improvement in Beach-Forming Jetties,of which the following is a full, clear, and exact description.

This invention relates to beach forming jetties for water fronts, andhas for its object to provide a jetty construction and an arrangement ofjetties sgch that a beach will be formed thereby, in a minimum space oftime. In accordance with my invention I attain the above object by aseries of jetties which are arranged in a row a short distance from theshore line, and are so constructed and arranged that the incoming wavesin passing through or between the jetties are intensified, and carryshoreward great quantities of sand or beach forming material,

and further, said jetties serve to retain or prevent the receding wavesfrom again carrying said material outward, with the result that apermanent beach is quickly formed.

In the preferred embodiment of my in vention, the jetties are arrangedin a row and are V shaped forming converging funnels for intensifyingthe incoming waves and having wide open inner ends or bases into which alarge part of the sand is washed and is thus prevented from again beingcarried outwardly by the receding waves.

My invention may be further briefly summarized as consisting in certainnovel combinations and arrangements of parts which will. be described inthe specification and set forth in the appended claims.

In the accompanying sheet of drawings Figure -1, is a plan view of asection of water front with the beach forming-jetties set up orconstructed. Fig. 2, is an enlarged top plan view of a section of one ofthe jetty walls. Fig. 3 is a similar view showing a modification, andFig. 4, is a side view ofa section of one of the walls. j

Referring to the drawings, 10 represents the shore line before the beachis formed, and 11 represents the beach forming jetties which areconstructed in the water a short distance from the shore line. Thesejetties which consist of a row vor series of spaced units are V shapedor triangular with the I apices of the trlangles seaward, and the basesshoreward. Each jetty is formed of two walls, 11*, and the bases areopenf0rming a triangular pocket, 11", closed seaward and open shoreward.

The spacing and size of the jetties may of course be varied, but in oneinstallation from which excellent results were obtained, the arms ofeach jetty were at right angles, as here shown, and were seventy-fivefeet in length, andthe jetties were 200 feet apart measured from apex toapex. This left between the bases of the adjacent jetties an open spacea proximately equal to the base or distance etween the inner ends of thearms of each jetty. These proportions are here shown and are preferred.Of course the number of jetties will depend on the length of the beachto be formed.

The jetties are preferably formed of concrete and each consists of anumber of spaced piles, 11, which extend down into the sand andintermediate slabs, 11, which rest on the bottom and which together withing the latter from ordinary waves or bil- I lows into breakers whichwash or roll quantities, of sand'or beach forming material shoreward,between and past the jetties.

' When the waves or breakers pass the jetties theyare greatly lessenedin intensity or are scattered because of the greatly widened space,beyond the narrowest space at the inner ends ofthe funnels. Then as thewaves 'recede' most of the material previously washedin is deposited andleft as a beach forming accretion, largely because the converging ortriangular pockets formed in the jetties stop or impede the outwardmovement. In consequence the beach is formed very rapidly in and totherear of the jetties, and also between the jetties, the beach beingformed from the shore line sub- .stantially up to the dotted linesmarked 12.

Having thus, described my invention, I

I 1. In a beach forming construction, a plurality of 'spaced jettiesarranged in a row and each composed of two arms diverging shorewardforming an outwardly converging pocket open shoreward and closedseaward, said jetties having an unobstructed space between them andbeing arranged sufficiently' close together that the adjacent arms ofadjacent jetties form inwardly or shorewardly converging funnels whichintensify the incomlng waves passlng through I them. 7 I v 2. In a beachforming construction, a plurality of V-shaped jetties arranged in 'a'rowwith their apices seaward and with their MARK A. GALLAHAN.

Witrlessesr v L. I. PORTER, A. KWIS.

